You may have to do some digging around various comic shops (online and "real) as well as Amazon to find them all (many have been compiled in four issue books which may be easier and more economical to find.)

Here's the order the comic arcs were released in...these also generally follow chronological order except for the D'Argo Tales which are backstories so you could either choose to read those on the below order like how they were originally released or you might prefer to read them before the others...

Although some are sold out, other issues are still available through boom-studios.com

Regarding the graphic novel 4 issue compilations: they're labeled "Volume 1, volume 2, etc" so it makes it a little easier to keep track of order those should be read. All the Dargo and Scorpius titles have come out in graphic novel form. Farscape Volume 7 (making up Farscape #13-16) is the most recent compilation to have been released with volume 8 (Farscape #17-20) to be released July 3rd) - so you may want to look for the graphic novel releases on amazon and hunt down the individual issues of #17-24.

Awesome news, DW! Thanks for keeping me on my toes with that knowledge.
What stinks is that I got into it all too late. At MuppetFest I didn't care about Farscape, and they were all there. Now, I hate myself for being that close to greatness and I missed it.

I managed to get 2 non-consecutive ones yesterday for free. I hope I can just jump in and read these without getting horribly confused. I HATE when I pick up a comic book and just go, "HUH?!?!" It's great for continuity and fans that follow the comics since the beginning, but a pain in the neck for those who are more casual.